Any hints on how to tackle the error? It obviously was introduced with 2.4 and I couldn’t even say where to look first after checking up upon the obvious…

I got a bbpress.php in place at /wp-content/themes/my-theme/ in order to wrap bbPress in style but even there I double checked the code and essentially there is nothing possibly conflicting (at least from what I see).

after playing with the permalinks as suggested, I’ve found a workaround. I was using the numeric setting on permalinks. I’ve tried with others options, and search worked. I noticed that all others permalinks ended with a /. I selected custom structure field and included a / in the end of the numeric link: /archives/%post_id%/

applying the trailing “/” had one side effect for me: I’ve lost the like count on the facebook share button for my posts, since the links have changed. minor issue for me, since my site is just starting…